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arXiv 1609.07310cond-mat.mes-hall
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单根铜纳米线发射声场的时空成像

Spatio-Temporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire Copper Nanowires Fabrication

Cyril Jean, Laurent Belliard, Thomas W. Cornelius, Olivier Thomas, Yan Pennec, Marco Cassinelli, Maria Eugenia Toimil-Molares, Bernard Perrin

摘要:

利用三维时间分辨飞秒泵浦-探测实验研究了直径为400 nm和120 nm的铜纳米线在10 $μ$ m硅膜上产生的单色和几何各向异性声场的透射特性.在硅衬底的两面同时进行了两次泵浦-探测时间分辨实验。在反射中,纳米线的第一径向呼吸模式被激发和检测。在透射过程中,观察到纵波和横波。纵向信号之后是与纳米线的第一径向呼吸模式的弛豫相关联的单色分量。进行时域有限差分(FDTD)模拟,并准确地再现衍射场。在声场中检测到由纳米线的大纵横比引起的形状各向异性。因此,下面的纳米线的取向声学推断。

英文摘要:

The monochromatic and geometrically anisotropic acoustic field generated by 400 nm and 120 nm diameter copper nanowires simply dropped on a 10 $μ$m silicon membrane is investigated in transmission using three-dimensional time-resolved femtosecond pump-probe experiments. Two pump-probe time-resolved experiments are carried out at the same time on both side of the silicon substrate. In reflection, the first radial breathing mode of the nanowire is excited and detected. In transmission, the longitudinal and shear waves are observed. The longitudinal signal is followed by a monochromatic component associated with the relaxation of the nanowire's first radial breathing mode. Finite Difference Time Domain (FDTD) simulations are performed and accurately reproduce the diffracted field. A shape anisotropy resulting from the large aspect ratio of the nanowire is detected in the acoustic field. The orientation of the underlying nanowires is thus acoustically deduced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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